Add pk_rsa_set_padding() and rsa_set_padding()
diff --git a/include/polarssl/pk.h b/include/polarssl/pk.h
index 013d973..8b84471 100644
--- a/include/polarssl/pk.h
+++ b/include/polarssl/pk.h
@@ -222,11 +222,31 @@
* POLARSSL_ERR_PK_BAD_INPUT_DATA on invalid input,
* POLARSSL_ERR_PK_MALLOC_FAILED on allocation failure.
*
- * \note For contexts holding an RSA-alt key, use
+ * \note For RSA contexts, padding defaults to PKCS_V15.
+ * Use pk_rsa_set_padding() to change it.
+ *
+ * \note To create a context holding an RSA-alt key, use
* \c pk_init_ctx_rsa_alt() instead.
*/
int pk_init_ctx( pk_context *ctx, const pk_info_t *info );
+#if defined(POLARSSL_RSA_C)
+/**
+ * \brief Set the padding method for an RSA key
+ *
+ * Note: Set padding to RSA_PKCS_V21 for the RSAES-OAEP
+ * encryption scheme and the RSASSA-PSS signature scheme.
+ *
+ * \param ctx PK context to be set
+ * \param padding RSA_PKCS_V15 or RSA_PKCS_V21
+ * \param hash_id RSA_PKCS_V21 hash identifier
+ *
+ * \note The hash_id parameter is actually ignored
+ * when using RSA_PKCS_V15 padding.
+ */
+int pk_rsa_set_padding( pk_context *ctx, int padding, int hash_id );
+#endif /* POLARSSL_RSA_C */
+
/**
* \brief Initialize an RSA-alt context
*
diff --git a/include/polarssl/rsa.h b/include/polarssl/rsa.h
index 504dde2..47315a3 100644
--- a/include/polarssl/rsa.h
+++ b/include/polarssl/rsa.h
@@ -125,7 +125,24 @@
*/
void rsa_init( rsa_context *ctx,
int padding,
- int hash_id);
+ int hash_id );
+
+/**
+ * \brief Set the padding method on an initilized RSA context.
+ *
+ * Note: Set padding to RSA_PKCS_V21 for the RSAES-OAEP
+ * encryption scheme and the RSASSA-PSS signature scheme.
+ *
+ * \param ctx RSA context to be set
+ * \param padding RSA_PKCS_V15 or RSA_PKCS_V21
+ * \param hash_id RSA_PKCS_V21 hash identifier
+ *
+ * \note The hash_id parameter is actually ignored
+ * when using RSA_PKCS_V15 padding.
+ */
+void rsa_set_padding( rsa_context *ctx,
+ int padding,
+ int hash_id );
/**
* \brief Generate an RSA keypair